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Dodge Challenger spied exercising supercharged Hellcat Hemi V8

One of the prime complaints against the Dodge Challenger is that, even in SRT8 guise, its 470 horsepower is responsible for hauling over 4,200 pounds of vehicle. For comparison, the 420 hp in the Ford Mustang GT only has to deal with 3,618 lbs. Things only get worse from there, as the higher-performance variants of both the Mustang and the Chevrolet Camaro are far more powerful than an SRT8 without adding on much heft.
So what is Chrysler to do? The correct answer is add a whole lot more grunt to its hefty two-door and even the odds. That's where the all-new Hellcat engine comes into play. We reported on this engine in May, and suggested that the Hellcat, a supercharged powerplant based on a 6.4-liter V8, would easily generate 500 to 570 hp and could likely arrive boasting more than 600 ponies.
Chrysler's ace in its sleeve has now been spied testing, with a number of Hellcat-equipped Challengers running the potent new engine both in more urbanized areas and under the sun of Death Valley. The hoods on these testers have been raised to accommodate the engine, and that camouflage over the fascias of these prototypes is there to hide a larger air intake. We also note what appears to be a new split grille under wraps. As for power output, our spies are now suggesting a Viper-equalling 640 hp from the Hellcat-equipped cars.

It ain't easy keeping a Hellcat steady at 170 mph on ice

The Dodge Challenger SRT Hellcat you see hit the ice at Arsunda Speed Weekend in Sweden, over two hours north of Stockholm. It's said to be bone stock, save for the studded tires that help it grip on ice. But it apparently takes more than some steel studs and a lead foot to keep it pointed the right way. Just look at how much driver Alx Danielsson has to saw at the wheel to keep the Hellcat from veering off course. Fortunately he seems to have the chops to do so, being not only a native of Sweden (and therefor imbued from birth with otherworldly abilities to drive on ice) but also having won the highly competitive Formula Renault 3.5 Series championship back in 2006. In the end Danielsson hit a top speed in excess of 170 miles per hour, touted as some sort of record, however unofficial (and specific to Dodge Challengers). That's a fair bit shy of the 205 mph that Bentley achieved in the Continental Supersports, but while that model had slightly less power than the Hellcat, it did have the benefit of all-wheel drive – something that could make all the difference in these kinds of slippery conditions. Related Video:

Old vs. New: 2014 SRT Viper takes on upgraded 16-year-old Dodge Viper

It's easy to play the "Would you rather have a New X or an Old Y with a bunch of upgrades?" game more often than we care to admit, but the crew at Car and Driver have taken bench racing to the next level with their latest video. In it, the magazine pits a brand-new 2014 SRT Viper against a highly modified 1997 Dodge Viper GTS. There are 16 years between the time this particular GTS rolled off the production line and when the new car bowed, but that doesn't mean the old snake's owners have been sitting on their hands.
Thanks to a spate of modifications, the GTS offers up a better power to weight ratio than the new machine, but is that enough to overcome the technological leap forward represented by the 2014 Viper? We won't spoil it for you. You'll just have to check out the full clip below for yourself.